Perforator



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INVENTO W0 si BY Hwy@ Z13 TORNEYS.

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vvnninnnrn fnndirlnrnninlnnnlnn Patented Sept. 25, 1928.

UNITED STATES PATEN'I" OFFICE;

WINFIELD 4'8. JONES, -0F REA, AND

HAROLD U. BAKER,- OF LOS ANGELES, CALI- FORNIA, ASSIGNOBS OF THREE-EIGHTHS T O WINFIELD S. JONES', TWO-EIGHTHS TO HAROLD U. BAKER, AND THREE-EIGHTHS T E. D. JONES, OI LOS ANGELES,

CALIFORNIA.

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Application med June 10, 1926.` Serialrlo. 114,917.

This invention relates to perforators, and particularly to casing perforators. The invention belongs to that class of perforators wherein the perforating tool is adapted yto 5 be lowered within well casing or tubing, and when the perforator has reached the desired zone within said casing to perforate the cassimple to operate, fool-proof, with practicallyl no working parts to get out of order.

A further object is the provision of a perforator wherein the perforatoris directly secured to the casing against movement during operation of said perforator.

In practicing the invention the perforator is provided with a curved cutting blade, a body formed to receive said cutting blade, slip members carried by the body, and a friction member, there being a rangible member between the friction member and a sleeve associated with the body. The sleeve in turn is secured to the slip, whereby when the rangible member is broken the slip ma be brought into engagement with casing to the body in a definite position within the casing, and whereby movement of the blade will perforatethe casing.v f

Another object is the revision of a perforator wherein the per orating member is so formed and constructed as to allow, its

ready withdrawal from tubing or casing after the blade has penetrated such tubing or cas.

ing.

A further object is the provision of a perforator adapted to keasily perforate concentric strings of tubing or casing without a binding of the perforating member.

With the above and other objects in view, the' invention consists in the novel and useul provision, formation, construction, association and relative arrangement of parts, mem? bers and features, all as shown'in certain e'ml bodiments in the accompanying drawings,

described generally and more particularly .pointed out. in the claims.

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In the drawings: Figure 1 is an elevation of the improved perforator; l

Figure 2 is a vertical sectional view of the improved perforator within well casing;

igure 3 is a further sectional view of the perforator within well casing and showing seA aration of certain parts thereof;

igures 4 and 5 are vertical sectional views showing the eifect'of movement of certain parts of the perforator;

Figure 6 is a vertical sectional view of the perforator and showing the blade element thereof perforating concentric strings of casingr; and,

igure 7 is a cross sectional view o a modiedt'orm of the perforator showing two slip members carried by the body,

Corresponding parts in all the figures are designated by the same reference characters.

Referring with particularity to the drawings the improved perforator is designated as an entirety by A, and the same includes a body a, a-member b movable relative to the body, gripping means c and d, a cutter e, and

means f for actuating the utter, all of which elements are used in practicing one embodi- Y ment of the present invention. The bod a gu is formed at one end with a circular cham rl or bore 1, and likewise provided with screw threads 2. Adapted to be received in part within said bore 1 is a plunger 3 constituting a part of the actuating means f for the cutter e. This plunger is formed with a he/ad 4 and a stem or arm 5, the stem or'arm 5 being substantially circular, and passedv through a guide nut 6, which nut is screw-threaded to the threads 2. The cutter e is arcuate or 'curved and adapted to be Vfitted within a curved bore 7 which communicates with the y bore 1 and externall of the body a, as shown at 8. `The cutter blade is secured to the plunger by means of a link 9, which link is pivoted respectively to the'plunger head 4 and an end of the cutter blade as indicated at 10 and 11. A The cutter blade is formed with a substantially sharp or pointed objectengaging nosev12. Thus 4if the plunger were allowed movementthe cutterblade would reciprocate within the curved bore 7 outwardly of the body and inwardly thereof. The cutc ter body is reduced as to diameter at'the end p and the member b which constitutes in realit als a sleeve is movable upon such reduced en The said sleeve is provided with a base portion 14 having a central bore 15. The bodyl a at the reduced end port-ion is recessed at- 16 to in part confine a latch 17 pivoted to said body at 18 and the said latch has a notched end 19. The sleeve b is slotted at 2O so that the said latch'may when in one position, a shown in Figure 2, engage an end wall 2l bounding said slot 20.

The body a is formed to carry one or more of the slips d, and the body to this end is formed with a plane surface 22 which is at an angle tothe outer surface of the body. This construction forms a ledge 23. A bore 24 is passed through the body at-the ledge portion 23 and adjacent the portion of reduced diameter of said body. The slip d is substantially wedge-shaped and is adapted to be substantially 'flush with the outer surface of the body when the same is fitted against the inclined wall 22, as shown in the figures. To retain/the slip to the body the lbodyis lformed with a dove-tail slot or race 2 5 and the slip is correspondingly dovetailed so as'to tit within such race. An arm 26 is` passed through said bore 24, 'and connected to the slip d. The-opposite end of said arm is secured to the sleeve b, as byproviding said arm with an angular extremity 27 received in a transverse bore 28 of the l sleeve. Adapted to be fitted within the sleeve lb and likewise slidablev therein, is a head 29,

and joined with said head is a mandrel 30 the shank portion of which is passed through. the bore15 in a, base of the sleeve. Carried on this mandrel and slidable thereon is the friction spring member c which includes two spring arms 31 and 32 which are secured to tp and bottom collars 33 and 34, which collars are carried on the mandrel. The sai-d Y member c is prevented from escape from the mandrel in any suitable manner such as by a nut 35 screw-threaded upon an end of the mandrel. To maintain the various parts in A association, as shown 1n Figure 2, a frangible i pin 36 is assed through the stem 3, and which pin will ear against the top surface of the nut secured to the body, and thus hold the plunger elevated and maintain the cutter within the bore -7 of the body. Likewise a frangible pin 37 is passed through aligned lbores inthe sleeve 'b and the head 29, wheree sition relative to said sleeve.

by the mandrel is maintained in a certain po- The position is likewise such that the latch 17 is held so that the' notch 19 bears against the head 29, as shown at 38. The latch is kept in tight engagement with the head :and likewise the sleeve through the medium of a leaf spring 39 Secured to the reduced portion of the body and bearing against the top edge ofthe said latch, 4as shownat 40.

The operation of the device is as follows:

wardly of such bore. Furthermore, if the frangible member 37 is unbroken, the sleeve b and the head 29 will be maintained in such relation that the latch 17 bears against such head, as shown at 19, and likewise Athe part 21 of the sleeve. When the parts are so positioned the slip member d-will have its outer face conforming to the general curvature o the body. Likewise it will be seen that the mandrel 30 has its end portion extending below the collar 34. The parts just described will be in the position shown in Figure 2. If now the tool is securedthrough the connection 41 to tubing running to the surface of the well, the perforator as an entirety may be lowered to any desired zone within well casing. If, as the drawings indicate, it is desired to perforate two concentric strings of casing, and having reached the desired zone for such perforations, further downward movement of the perforator is stopped and upon givingvthe perforator a sudden upward pull the frangible member 37 will be sheared, as shown at 42, due to the fact that the member c will grip the inner surface of the casing7 and the collar 34 with the nut 35 carried by the mandrel, and likewise further due to inertia eii'ect, the member c tending to remain stationary while'other parts of the perforator are moved. The parts of the perforator will now assume the position indicated in Figure Y3 wherein the latch 17 will become disengaged from the part 2l of the sleeve, and likewise an edgeof the head 29. Y

The upward movement -of the perforator .body is lcontinued until the head 29 reaches the lowermost position that it ma assume i within the sleeve, as indicated in Upon reversing the movement, that is, moving the body of the perforator downwardly, the slip, due to its connection with the sleeve igure 4.V

will now move along the inclined face of the moval of the cutter is an easy matter, as the inclined cut given theasings and the inclined relation of the utter to Said casings renders-it only necessary to exert an upward pull upon the plunger 3 to pull the cutter from such perforations. Thus sticking of the cutter within the casings is entirely done awaywith, a feature of great importance, where more than one casin is to be perforated at a time. The pe orator is ensilv withdrawn from the -well hole-.and as many places as desired ma be perforated in the manner indicated. e slip at all times carries the weight of the body and likewiserevents downward movement of the body w ile the cutter is` operating. As indicated 1n nre 7, more t the slipsbeing angularly related as shown `in the igure. l

It is obvious that variouschan es and mod-- ilications ma be made in practicing the Vin- ;vention, in showin without departing from the true eparture from the particular spirit o the invention.

Havin thus disclosed our invention, we claim an desire to secure'by Letters Patent: 1. Improvements in rforators, including a cutter, a body forme to receivesaid cutter, friction means, a sleevecarried by said body and connected with said friction means, and

a slip. movable relative to the body and associated with the sleve, and afran 'ble member between the friction means an' the sleeve and adapted when sheared to releasethe slip from aA given position. Y

2. Im rovements in-perforators adapted to be place within' well casing, including a body formed with a chamberedportionfa plunger within said chambered portion, a cutter blade secured to said' plunger, a sleeve carried on the body, 'a frictionfmemberfand frangible means between the friction member and the sleeveand means 'between the body and sleeve for maintaining said frangible' .member intact $8 during movement of the perforator within the casing.

.3. Improvements perforators adapted to F- an' one slip may be provid bn'p1wed wiinin wen' ming, including nr ,member between the head and the sleeve, a mandrel carried by the head', anda friction member upon said mandrel, a slip carried by the body and linked to the sleeve, and whereby downward movement of the bod move 'the slip into engagement with t ev casin) to lstop such downward movement of the y. I 5. Improvements in perforators ada ted to be placed within vwell casing, inclu inga body, a sleeve carried at one end of said bod a headwithin said sleeve and a fra-ngib ev mem r between the head and the sleeve la mandrel carriedoby the head, and a friction member upon said mandrel, a slip carried by the body ani linked to the sleeve, and whereby downward movement of the body willl move the slipv into engagement with the casing to stop such downward movement of the body; in combination with-a cutter adapted ti moved frolm the said body when the sipisen gmgt ecasing.`

In testgliiiony whereof,.wehave signed our names to this specification.

WINFIELDAS. JONES. HAROLD U. BAKER.

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